When adding a post, just have your cursor where you want to drop a picture.
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Then go back to typing your report. You can even add the picture later if you want to type everything first.
With the pic above, make sure your cursor is at the black line, then click Attach Files and select the picture you want to upload. Then click thumbnail or full image. Big vs little picture.
To create a link to another post to jump to, you will need to "share" the post link then copy it:
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In the picture, the share is the little triangle underlined and copy is the circled icon.
You can either paste the link directly or link from specific words using the link icon above. I can't get my toolbar to work on my phone though.
https://www.disboards.com/threads/how-to-put-together-a-trip-report.3823638/